using System;
using System.Collections;

namespace CollectionsApplication
{
  class Program
  {
    static void Main(string[] args)
    {
      SortedList sl = new SortedList();

      sl.Add("001", "Zara Ali");
      sl.Add("002", "Abida Rehman");
      sl.Add("003", "Joe Holzner");
      sl.Add("004", "Mausam Benazir Nur");
      sl.Add("005", "M. Amlan");
      sl.Add("006", "M. Arif");
      sl.Add("007", "Ritesh Saikia");

      if (sl.ContainsValue("Nuha Ali"))
      {
        Console.WriteLine("This student name is already in the list");
      }
      else
      {
        sl.Add("008", "Nuha Ali");
      }

      // 获取键的集合
      ICollection key = sl.Keys;

      foreach (string k in key)
      {
        Console.WriteLine(k + ": " + sl[k]);
      }
    }
  }
}